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A Game of Thrones

While out riding with Sansa Stark, Prince Joffrey Baratheon comes across Arya Stark and the common boy, Mycah, playing at swords with wooden sticks. He threatens Mycah, which leads Arya to attack him with her stick. Joffrey then threatens Arya with the sword, slashing at her, until Nymeria bites him to protect her. Arya throws Lion's Tooth into the Trident.[1]

At Arya's trial, Renly Baratheon laughs at Joffrey being disarmed by a nine-year-old girl, and also at the sword's name.[2]

A Clash of Kings

King Joffrey receives a replacement sword, Hearteater. Sansa recalls how Arya had thrown Lion's Tooth in the river, and hopes that Stannis Baratheon will do the same with Joffrey's new sword.[3]

A Storm of Swords

Within the hollow hill, Arya Stark misremembers the sword's name as "Lion's Paw".[4]George R.R. Martin has stated that he was was trying to establish that the memories of his viewpoint characters are not infallible by having Lion's Tooth's name being misremembered (though this is accidentally attributed to Sansa Stark, instead of Arya).[5]